Cells in xylem:

In the vascular plant phylogeny, the Lycophytes are sister to the Euphyllophytes.

Molecular data indicate that the gnetophytes (Gnetum, Ephedra, Welwitschia) are most closely related to:

Which of the following is diploid (2N) in the pine life cycle?

Which of the following  is a fungal group that includes human pathogens, plant pathogens, mushrooms, lichens and yeasts?

Oogamous species:

Researchers have found that when older adults engage in complex tasks and challenging activities at work their cognitive function show less age related decrease.  

There are NO living organisms that have chloroplasts with peptidoglycan walls.

Recognized human parasitic disease organisms are known from all of the following groups except which one?

Chemoheterotrophic organisms are entirely prokaryotic.